<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>qrcode</title>
</head>
<body>
<div id="qrcode"></div>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<!--<script src="jquery-qrcode-master/jquery.qrcode.min.js"></script>-->
<script src="https://cdn.bootcss.com/jquery.qrcode/1.0/jquery.qrcode.min.js"></script>
<script>
    $('#qrcode').qrcode("this plugin is great");
    $('#qrcode').qrcode({width: 64,height: 64,text: "size doesn't matter"});
</script>
</body>
</html>